378 ME. G. C. EOBSON ON LAND AND 



These two forms are from Vinaninony (Madagascar) and the R. Chozi 

 (B. Central Africa). 



4. *Paludomus Grandidieri, Crosse ^- Fischer. 



Crosse & Fischer, Journ. de Concli. 1872, p. 209. 



Localitij ? (Krister, Couch.-Cab. F. p. 45, gives " streams of E. Mada- 

 gascar (Grandidier) "). 



5. *Paludomus madagascariensis, Brot. 



Brot, in Kiister s Conch. -Cab. 1880, vol. F. 



Locality. Cf. no. 4 (Brot only gives " Madagascar "). 



This species is represented by a single example slightly differing from the 

 typical form in that the shoulders of the apical whorls are ornamented 

 with a rim. 



It would appear that these two species are the only representatives of 

 the genus, which is otherwise restricted to India, and largely to Ceylon. 

 The allied genera Tanalia, Stomatodoa, and Pliilopotamis are essentially 

 Singhalese. 



6. *MeLANATRTA FLUMINEA (6'm(?/«n). 



Gmelin, Syst. 3503, Buccinumjlwnincum. 



Torrents between Matilasu and Mangoro (E.)^ and at source of R. Ihovika 

 (1000 m. alt.). 

 Lake Alaotra ? 

 Representative examples. 



7. *Melanatria Johnstoni, E. A. Smith. 



Smith, P. Z. S. 1882. 



Mahavavy, Belolondy (100 m. alt.), and Mahavavy-Ttmdrahn. 

 Representative examples. 



8. ? Melania psorica, Morelet. 



Morelet, Journ. de Conch. 1864, p. 287. 



Locality ? 



Represented by a few weathered nnd incomplete specimens. 



Though agreeing in most respects with the figure and description oi psorica, 

 these examples, however, exhibit an aperture very effuse towards the base. 

 If more mateiial of good condition were forthcoming, it might lead one to 

 consider this a new species, though in any case it is very near pson'm. 



In general this species appears to be allied to the rvdis group (Ceylon- 

 Amboina). 



